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How to prevent common defects of spring in the process of heat treatment?
Published：2014.08.19 News Sources：kaichuang spring machinery Views：
In the spring forming process, some spring needs to reach or strengthen certain properties must be heat treatment process. Heat treatment process is not a simple temperature heating factors relates to control the heating time to temperature control, and heat treatment and so on, any or all of these factors will influence the effect of heat treatment. So, what defect will be common spring heat treatment process? How to prevent common defects of spring in the process of heat treatment?
Common spring such as tensile, compression spring in the process of heat treatment defect has the following five kinds of situations:
1, spring deformation and cracking;
2, the temperature of overheating and over burning;
3, the surface oxidation and decarbonization;
4, the hardness is too high and too low;
5, the surface corrosion.
For example, stretching the spring will appear the phenomenon of cracking and deformation during quenching, the force and stress interaction results should be by heat, so the prevention should be to reduce the internal stress of crack during heat treatment in the quenching process should pay attention to the following points:
1, in the quenching process, overheating tendencies spring materials such as 65Mn, SiMn spring steel is larger, the heating temperature should not be taken too high, in order to avoid overheating occurs;
2, to ensure the quenching condition, should try to use cooling can ease medium;
In 3, after quenching, tempering, quenching oil spring generally within 8 hours after tempering.
During quenching, spring overheating may be by grain refinement of annealing remedies. If the quenching temperature is too high, and the austenite grain boundary spring local has melted, this phenomenon is called burnt; spring burning is irreparable, only to discard.
Oxidation and decarburization is one of the most common ills in the heat treatment process and methods of its prevention to also try to use salt bath furnace. Heating temperature should not be too high, pay attention to control temperature, applied on the surface of anti decarburization coating, should be strictly in accordance with the norms of the holding time of.
The quenching process, the hardness is too high is generally caused by tempering temperature is too low or the holding time is insufficient, such as high hardness can be corrected through the secondary tempering; low hardness by quenching under low temperature, holding time and cooling speed is not enough or the tempering temperature is too high, cause, this situation should be remedied quenching treatment re the. Spring (computer spring machine)during the heat treatment, the surface should be timely and thorough cleaning; if not timely cleaning or not clean, it can be attached to the surface of the residual salt, it is prone to corrosion. The information content from Kaichuang spring machine: http://www.kcmcnc/en/.
Common spring such as tensile, compression spring in the process of heat treatment defect has the following five kinds of situations:
1, spring deformation and cracking;
2, the temperature of overheating and over burning;
3, the surface oxidation and decarbonization;
4, the hardness is too high and too low;
5, the surface corrosion.
For example, stretching the spring will appear the phenomenon of cracking and deformation during quenching, the force and stress interaction results should be by heat, so the prevention should be to reduce the internal stress of crack during heat treatment in the quenching process should pay attention to the following points:
1, in the quenching process, overheating tendencies spring materials such as 65Mn, SiMn spring steel is larger, the heating temperature should not be taken too high, in order to avoid overheating occurs;
2, to ensure the quenching condition, should try to use cooling can ease medium;
In 3, after quenching, tempering, quenching oil spring generally within 8 hours after tempering.
During quenching, spring overheating may be by grain refinement of annealing remedies. If the quenching temperature is too high, and the austenite grain boundary spring local has melted, this phenomenon is called burnt; spring burning is irreparable, only to discard.
Oxidation and decarburization is one of the most common ills in the heat treatment process and methods of its prevention to also try to use salt bath furnace. Heating temperature should not be too high, pay attention to control temperature, applied on the surface of anti decarburization coating, should be strictly in accordance with the norms of the holding time of.
The quenching process, the hardness is too high is generally caused by tempering temperature is too low or the holding time is insufficient, such as high hardness can be corrected through the secondary tempering; low hardness by quenching under low temperature, holding time and cooling speed is not enough or the tempering temperature is too high, cause, this situation should be remedied quenching treatment re the. Spring (computer spring machine)during the heat treatment, the surface should be timely and thorough cleaning; if not timely cleaning or not clean, it can be attached to the surface of the residual salt, it is prone to corrosion. The information content from Kaichuang spring machine: http://www.kcmcnc/en/.